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I bring a variety of genres (just did this exercise last month when shopping for new speakers).

Lark Ascending (Hilary Hahn on violin) SACD--I use this track to focus on how well the tweeter deals with high frequencies.
Cuckoo Cocoon (Rewiring Genesis) CD--acoustic guitar and some good vocal harmonies. Useful to determine how wide a soundstage appears to be when the setting is rather minimalist with instrumentation.
A few tracks from Ella and Louis CD--tests how well the tweeters will forgive (or not) less than ideal recordings from over half a century ago (I have a lot of that kind of stuff, so the speakers cannot be too harsh with it, even if that means I'm sacrificing detail/accuracy elsewhere).
YYZ (Rush)--CD or DVD-A (depending on available playback device in store)--opening sequence tests the clarity of tweeters, rest of it gives a good idea if the speakers can rock out with some decency

These were my initial "go-to" tunes for speaker selection. If a speaker did well with all the above (a few did, many did not), then I have a lengthier list of other material I use to make the final call--some big band jazz, classical orchestral music (Tchaikovsky, Beethoven, Elgar and Shostakovich), some Miles Davis and John Coltrane, more Ella, 70's era Genesis (especially tracks from Selling England by the Pound), some solo piano (jazz and classical).

A variety of musical genres and extreme familiarity with the material are two essential elements of good "demo music" when shopping for speakers.

I recently discovered "The Essential Bob Dylan" set, and these remasters are fantastic. Songs with harmonica are particularly good for teasing out treble detail and judging "airiness" (although you really need to hear the tracks on a reference system first to know what less capable equipment is missing). You'll also find out real quickly if your speakers are too bright.